C6 DIPTERA OF NORTH AMERICA. [PART IV. 



could not very well describe the color of the front wliich, iu all 

 my specimens, is shrunken. 



•y. D. lirevivena-, n. sp. % and 9. — Ocliracea vel fusco-ochracea ; 

 rostro ochraceo ; antennis nigro-fuscis, tliorace vittis tribus fuscis ; vense 

 auxiliaris apex prsefurcse initio anterior ; prsefurcS, brevi ; cellula dis- 

 coidali plerumque aperta. 



Ocliraceous or brownish-ochraceons ; rostrum ocliraceous ; antennse brown- 

 ish-black ; thorax with, three brown stripes ; the tip- of the auxiliary 

 rein is anterior to the origin of the prsefurca ; the latter short ; the 

 discal cell in most specimens open. Long. corp. 0.2 — 0.23. 



The coloring of the body is either of a light brownish-yellow, 

 or a more ochraceous yellow ; head brownish, front infuscated in 

 the middle ; rostrum yellow ; antennae dark brown. Thorax 

 ochraceous with three brown stripes, the intermediate one broad 

 and distinct, the lateral ones extending backwards beyond the 

 suture are slightly pruinose with grayish ; collare brown above, 

 prolonged in a distinct neck ; scutellum infuscated at both ends, 

 metathorax brownish, pruinose with grayish ; pleurae ochraceous, 

 more brownish posteriorly ; stem of halteres pale at the basis, 

 knob infuscated. Abdomen brownish above, pale below ; male 

 genitals ochraceous. Feet dark tawny ; coxa3 and base of the 

 femora pale ; tarsi brown towards the tip. Wings almost hya- 

 line, very slightly tinged ; stigma pale. The tip of the auxiliary 

 vein is anterior to the origin of the praefurca by about half a 

 length of the stigma ; the crosS-veiu is at about an equal distance 

 from the tip of the auxiliary vein ; the first longitudinal vein has 

 the marginal cross-vein by its tip ; the prtefurca is short, in some 

 specimens shorter than the distance between the origin of the 

 third longitudinal vein and the' small cross-vein ; in other speci- 

 mens, it is a little longer. The discal cell is usually open ; one 

 of my specimens (among ten) has it closed. 



Hob. New York ; also in Washington, D. C. This species 

 can be easily distinguished from the two other species with a 

 short auxiliary vein (Jloridana and rostrifera) by its yellow 

 rostrum. 



I have taken, in the marshes on Long Island, near New York, 

 in autumn, several specimens which are somewhat larger and 

 darker in coloring; the thorax is brownish, sericeous with yel- 

 lowish above, and with three dark brown stripes; the abdomen 



